If you have created an image yourself, and you have a higher-quality source file in a format such as .rXCF, .PSD, or .AI, you may want to consider uploading that source file so that other users can more easily modify it if the need arises. Link the source file from the image description page. If the source file is too large to upload, try compressing it with a utility such as [[WinZip]] or [[gzip]].
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